Drop region parameter to Unbounded, as it can be done without.

Drop region parameter to Unbounded, as it can be done without.

Unbounded is defined in terms of None any Any,
which don't require an explicit zone.
Switching Unbounded to be the same.

BUG= None
TEST= trybots
R= titzer@chromium.org
LOG=N

Committed: https://crrev.com/204b6ff066eb735fe183783dc5b6d7ca14777867
Cr-Commit-Position: refs/heads/master@{#30482}

[titzer, 2015-08-31 17:35:05]

lgtm

[bradn, 2015-08-31 17:35:21]

The CQ bit was checked by bradnelson@google.com

[commit-bot: I haz the power, 2015-08-31 17:35:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1322003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1322003002/1

[commit-bot: I haz the power, 2015-08-31 17:37:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-31 17:37:25]

Patchset 1 (id:??) landed as
https://crrev.com/204b6ff066eb735fe183783dc5b6d7ca14777867
Cr-Commit-Position: refs/heads/master@{#30482}